Professional wireless microphones have been in use for almost 50 years now. The operation is based on a frequency sharing with TV broadcast transmitters. With the transition to digital TV, this situation changes. Digital TV is more spectrum efficient. After the transition is completed, areas of the spectrum, will be cleared from TV broadcast and will be available for new services. These cleared spectrum areas are referred to as digital dividend or white spaces. By the allocation of these band to other services, valuable resources for the operation of professional wireless microphones will be lost. This paper will give an overview on the current situation for Professional wireless microphones and the upcoming changes with the transition to digital TV.
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